My historic document into the 1790's gateway Canons gate, all my research go to:
English Heritage:
1997 - Jonathan Coad
2012 - Steven Brindle
Department of the Environment:
1975 - R. Allen Brown.
many thanks to Subterranean History, for the Martello Tower photos.
http://www.subterraneanhistory.co.uk/
For great sound effect visit:
https://www.youtube.com/user/YTSoundEffects
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